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Letters .Patent No. 73,401, dated January-I4, 1868. I

IMPROVEMENT IN MECHANICAL MOVEMENTS.

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To ALL wHoM nr MAY ooNcEnN:

Be it known that I, EPHRAIM SoPEmof the city, county, and State of New York, have invented a new and improved Mechanical Movement; and I do hereby declare that the following is a full, clear,and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in whch- Figures 1 and 2 represent end elevations of my invention.

Figures 3 and 4 are side views, partly-in section, of the same.

Similar letters of reference indicate corresponding parts. y

This invention relates to a new manner of arranging the crank' of machinery, and consists in fitting geur- Wheels to the'crank so. as to obtain from a stationary pinion, mounted on the wrist-pin, additional revolutions or parts ofrevolutions for the shaft. s

AA gear-wheel is mounted on the shaft, and another on-the wrist-pin, the'crank itself turning -loose on the shaft. As the crank is being turned, the wheel, mounted on the wrist-pin, is held on the same, so that it can only turn around the axis of the shaft and not around its owuaxis. The wheel on the shaftthus receives one revolution by the rotation ofthe crank, which crank is actually composed of the two gear-wheels; but the wheel on the shaft-receives an additional revolution or part of a revolution, by the action of the outer or wristwheel upon the inner or shaft-wheel. If the two wheels were of equali diameters, the shaft would be revolved twice during one revolution of the-crank, as it receives one revolution from the simple rotation of the crank, and one more'by the motion of the wrist-wheel, around the shaft-wheel, whereby the latter is caused to turn once around its axis, so as to follow the teeth ofthe outer wheel. d

If the wrist-wheel is smaller than the shaft-wheel, the latter will, during one revolution of the crank, revolve once and a fraction, which is equal to the fraction obtained by dividing the diameter of the wrist-wheel by that of 'the shaft-wheel. If the wrist-wheel is larger than the shaft-wheel, the shaft will revolve so much oftener than once -as the diameter of the shaft-wheel is contained in that of the wrist-wheel. And thus, by means of this invention, the shaft will revolve quicker than thecrank, whatever the respective diameters of the gearwheels may bo. Y

' v The invention will be particularly yuseful for sewing-machines, and other similar small machines, but may also be used advantageously for large engines. The dead-centre will be successfully overcome as the increased momentum of the shaft tends to aid the crank in its motion. i

A represents a shaft; B is a gear-wheel, mounted on the same; C is a plate or'bar, projecting from the' 'i shaft attached lto the same, in such a manner that it can revolve `freely around it. Into the outer part ofthe Aplate C, is tted a pin, a, upon which is mounted a gear-wheel, D, as shown in fig. 1,'the pin a 'and its vwheel turning freely in the plate. To the pin a, which thus forms the'wrst-pin of the crank, isattaebed the connectingrodE, as shown. The wheels D and B mesh into each other, and thus actually formthe crank, the plate C only serving to support the pin a. In figs`..1 and the wrist-wheel D is represented' as having twice the diameter and -twice the number of teeth as the wheelB. As soon ns the connecting-rod is set in motion itv carriestlle Wheel D around the shaft A, and around the wheel B, and the shaft makes one revolution,owing to this motion-of the crank; but the shaft makes, duringr the same revolution of the crank, two other revolutions, as the teeth of the smallwheel, B, have to mesh into thoseof the large` wheel, D, and as the wheel B must thus revolve twicel in order to follow the wheel D, the shaft thus makes three revolutions during one of the crank, or, in other words, it makesas man); more revolutions thanoneas the diameter of the shaft-wheel isl contained in that of the wrist-wheel which here is v i Iniigs. 2 and 4, the diameter of thewrist-wheel is reprcscnte-d as beinghalf as long as that of the shaftwheel. The above rule will also apply here, and it would follow that the shaft revolves one `and a half time' ,during cach revolution of the crank. i The wheels may,Y if desired, be wholly or partlyencased, as shown. Suitable gear-wheeis may be interposed between the wheels B and D, if desired, their axles being fitted to the plate C.

If desired, the plate C may be increased in size to*4 receive five,`more or less, wrist-wheels, revolving around the central shaft-wheel. I do not, therefore, confine myself to the use of 'two wheels simply.

AHaving thus described my invention, what I claim as new, and desire to s'ecure by Letters Patent, is-

A crank, when composed of the gear-wheels B and D, or their equivalents, and of the plates C and pin a,

all made substantially as described, and operating so that the velocity of the shaft is increased without increasing the number voffrevolutions of the crank. E. SOPER.

Witnesses: l

WM.` F. McNAMAnA 'Annan F. Roinnrs.4 

